HD Electric Co.’s DVI-500 Digital Voltage Indicators are a new addition to the Digital Voltage Indicator line. HD Electric Co.'s DVI-500 Digital Voltage Indicators are a new addition to the Digital ...

The circuit is designed to connect in parallel with the telephone line, to monitor and detect if any telephone in the same line is busy, with the indication of the LED and which is self-powered so ...

These medium-voltage indicators flash with enough illumination to allow safe viewing from outside the enclosure through an access window These medium-voltage indicators flash with enough illumination ...

HD Electric Co.’s DVI-100T Digital Voltage Indicator with capacitive test point mode is a direct-contact, compact instrument designed to read the voltage on a conductor up to 99 kV line-to-ground.

This circuit, designed on request, has proven to be useful to indicate when the voltage in a power supply line is changing from 120V to 240Vac. It can be used in different circumstances and circuits, ...